What was the first baseball stadium?

The 1920s represented a beautiful time in American baseball history, with beautiful, large stadiums being built across the country that fans flocked to. These include: the now defunct Cubs Park for the Chicago Cubs built in 1920, Sportsman's Park for the St. Louis Cardinals in 1920, and the first version of Yankee Stadium for the New York Yankees in 1923. Other ballparks were built, as well, but these represent the Major League Baseball parks built in the 1920s.